In the latest show of military muscle in the South China Sea, the U.S. has apparently sailed its USS Wasp amphibious assault ship near a strategic reef claimed by Beijing and Manila that lies just 230 km (140 miles) from the Philippine coast.

Filipino fishermen near the site known as the Scarborough Shoal initially spotted what appeared to be the massive U.S. vessel on Tuesday, according to ABS-CBN News. It said planes were seen landing and taking off from the ship, some 5 km (3 miles) away from the fishermen's boat. A video clip shown by the news network appeared to corroborate their account.

Contacted by The Japan Times, a U.S. military spokeswoman would not confirm or deny the Wasp's presence near the collection of outcroppings that barely jut out above water at high tide, citing "force protection and security." However, the spokeswoman did confirm that the Wasp "has been training with Philippine Navy ships in Subic Bay and in international waters of the South China Sea ... for several days."